Joshua 24:19-20

19Then Joshua said to the people, “You will not be able to serve the Lord [if you serve any other gods], for He is a holy God; He is a jealous God [demanding what is rightfully and uniquely His]. He will not forgive your transgression [of His law] or your sins.

20If you do abandon (reject) the Lord and serve foreign gods, then He will turn and do you harm and consume and destroy you after He has done you good.”